Fundamentals of organic chemistry (1) questions

Assignment: Questions on Topic 10.1 : Fundamentals of organic chemistry (1)

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Name the following three compounds according to the IUPAC convention:

i.

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ii.

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iii.

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State the general formula for the following homologous series:

i. alcohols (of which methanol is the first member of the series)

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ii. alkenes

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iii. alkynes

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iv. amines (of which methanamine (methylamine) is the first member of the series)

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Cyclohexene contains six carbon atoms in a ring with one double bond between two of the carbon atoms. It has the following structure:

i.  State the molecular formula of cyclohexene.

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ii. Explain why the molecular formula of cyclohexene does not fit the general formula for the alkenes homologous series.

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iii. Cyclohexene is unsaturated. Give the equation for the reaction of cyclohexene with hydrogen.

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iv. Cyclohexene contains one C=C double bond. When it is hydrogenated (hydrogen is added) the enthalpy change is approximately – 120 kJ mol−1. Benzene also contains six carbon atoms in a ring and has the molecular formula C6H6. The enthalpy change for the hydrogenation of benzene to form C6H12 is approximately – 210 kJ mol−1.
Explain why this value is not equal to approximately three times the value obtained when cyclohexene is hydrogenated.

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